Dome and diaphragm assembly of sound-generating device, and sound-generating device and electronic device

Abstract

The present invention discloses a dome, a diaphragm assembly, a sounding device and an electronic device of a sounding device. The dome comprises an organic aerogel matrix and reinforcing materials dispersed in the organic aerogel matrix; the mass of the organic aerogel matrix accounts for 10% to 95% of the total mass of the dome, and the modulus density ratio of the dome is greater than or equal to 5 GPa·cm<supgt;3< / supgt> / g. The dome provided by the present invention is light in mass, which is beneficial to meeting the design requirements of the sounding device for being thin, light and miniaturized on the one hand, and can also reduce the resonance frequency of the sounding device and improve its mid-frequency sensitivity on the other hand. In addition, the reinforcing materials dispersed in the organic aerogel matrix combine with the low-density characteristics of the organic aerogel, so that the prepared dome has a high modulus density ratio, and has both rigidity and damping. When applied to a sounding device, it can improve its structural stability, obtain a high high-frequency cut-off frequency, and improve the acoustic reliability of the sounding device.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic equipment, and more specifically, to a dome of a sound-generating device, a diaphragm assembly, a sound-generating device and an electronic device. Background Art

[0002] With the development of science and technology, the application of electronic products is becoming more and more extensive. As electronic products become increasingly thin and light, speakers need to further expand their high and low frequency range and mid-frequency sensitivity. That is, speakers need to have a suitable low-frequency resonant frequency, a suitable high-frequency cutoff frequency and good mid-frequency sensitivity.

[0003] In the prior art, a dome is usually designed on the diaphragm of a loudspeaker to increase the strength of the diaphragm. Traditional domes are mostly in the form of aluminum foil + adhesive layer + foam + adhesive layer + aluminum foil, which is not only heavy, but also prone to stratification during use and has poor damping properties, resulting in poor structural stability and mechanical properties of the dome, affecting the service life and acoustic effects of the speaker. Summary of the invention

[0004] One object of the present invention is to provide a new technical solution for a dome of a sound-generating device, a diaphragm assembly, and a sound-generating device and an electronic device.

[0005] According to a first aspect of the present invention, a dome of a sound-generating device is provided, the dome comprising an organic aerogel matrix and a reinforcing material dispersed in the organic aerogel matrix; the mass of the organic aerogel matrix accounts for 10% to 95% of the total mass of the dome, and the modulus-to-density ratio of the dome is greater than or equal to 5 GPa·cm 3 / g.

[0006] Optionally, the modulus density of the dome is 5 GPa·cm 3 / g~40GPa·cm 3 / g.

[0007] Optionally, the damping value of the spherical top is 0.02-0.15.

[0008] Optionally, the bending modulus of the dome is 0.5 GPa to 15 GPa.

[0009] Optionally, the thickness of the dome is 10 μm to 300 μm.

[0010] Optionally, the reinforcement material includes reinforcement fibers and / or reinforcement particles.

[0011] Optionally, the reinforcement material is reinforcement fiber, and the mass of the reinforcement fiber accounts for 5% to 50% of the total mass of the dome.

[0012] Optionally, the reinforcement material is reinforcement particles, and the mass of the reinforcement particles accounts for 5% to 40% of the total mass of the dome.

[0013] Optionally, the reinforcing material includes the reinforcing fibers and the reinforcing particles, wherein a mass proportion of the reinforcing fibers in the dome is greater than a mass proportion of the reinforcing particles.

[0014] Optionally, the reinforcing fiber is at least one of chopped fiber, continuous fiber, fabric and non-woven fabric; and / or,

[0015] The reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black, aluminum oxide and metal particles.

[0016] Optionally, the organic aerogel matrix is ​​made of at least one material selected from the group consisting of polyimides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides and silicones.

[0017] According to a second aspect of the present invention, a diaphragm assembly of a sound-generating device is provided, comprising: a diaphragm and the dome of the sound-generating device according to the first aspect, wherein the dome is bonded to the diaphragm or the dome is integrally injection-molded with the diaphragm.

[0018] Optionally, the diaphragm is made of one or more composite materials selected from engineering plastics, elastomeric materials, and adhesive films, and the thickness of the diaphragm is 0.01 mm to 0.5 mm.

[0019] According to a third aspect of the present invention, there is provided a sound-generating device, comprising: the diaphragm assembly described in the second aspect.

[0020] According to a fourth aspect of the present invention, there is provided an electronic device, comprising: the sound-generating device according to the third aspect.

[0021] According to one embodiment of the present invention, a technical effect of the present invention is:

[0022] The present invention prepares the spherical top of the sound-generating device by dispersing the reinforcing material in an organic aerogel matrix, wherein the organic aerogel matrix is ​​made of a high molecular organic material and has a criss-cross porous network structure inside, and its mass proportion is limited to a suitable range, so that the prepared spherical top is light in weight. On the one hand, it is conducive to meeting the design requirements of lightweight and miniaturized sound-generating devices, and on the other hand, it can also reduce the resonant frequency of the sound-generating device and improve its mid-frequency sensitivity.

[0023] In addition, the reinforcing material dispersed in the organic aerogel matrix has characteristics such as high strength and high modulus. Combined with the low density of the organic aerogel, the prepared dome has a high modulus-to-density ratio, with both rigidity and damping, and has excellent mechanical properties. When applied to a sound-generating device, it can improve its structural stability, obtain a higher high-frequency cutoff frequency, and improve the acoustic reliability of the sound-generating device.

[0024] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0026] Figure 1 It is a structural schematic diagram of a diaphragm assembly provided by the present invention.

[0027] Figure 2 It is a frequency response curve diagram of each sound-generating device in Example 1 and Comparative Example 1 provided by the present invention.

[0028] 1. Dome; 2. Diaphragm. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] according to Figure 1As shown, the present invention provides a dome 1 of a sound-generating device, wherein the dome 1 comprises an organic aerogel matrix and a reinforcing material dispersed in the organic aerogel matrix; the mass of the organic aerogel matrix accounts for 10% to 95% of the total mass of the dome 1, and the modulus-to-density ratio of the dome 1 is greater than or equal to 5 GPa·cm 3 / g.

[0035] Specifically, the dome 1, as a part of the diaphragm assembly, is usually arranged at the center of the diaphragm 2 to enhance the strength of the diaphragm 2. Therefore, the various properties of the dome 1 play an important role in the sound performance of the entire sound-generating device. In some sound-generating devices, the dome 1 needs to meet the requirements of low density, high strength and other properties at the same time to meet the design requirements of the structure and acoustic performance of the sound-generating device.

[0036] In this embodiment, the reinforcing material is dispersed in an organic aerogel matrix to prepare the dome 1 of the sound-generating device, wherein the organic aerogel matrix is ​​prepared by using a polymer organic material, and the organic material type can be selected from polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins, polysaccharides, etc., and has a criss-cross porous network structure inside. Compared with traditional materials, such as engineering plastics, it has the advantages of low density, large specific surface area, high porosity, and high specific strength. The prepared dome 1 has a lighter weight and higher strength, and has better medium and low frequency sensitivity when used in the sound-generating device.

[0037] The reinforcing material added to the organic aerogel matrix has the characteristics of high strength, high modulus, etc., and combined with the low density of the organic aerogel, the prepared dome 1 has a higher modulus-to-density ratio. Among them, the modulus-to-density ratio of the dome = the modulus of the dome / the density of the dome. The larger the modulus-to-density ratio, the larger the high-frequency cutoff frequency, thereby widening the intermediate frequency of the sound-generating device, so that the sound-generating device can obtain a clear response to the input signal within a wider frequency range, thereby improving the acoustic effect of the sound-generating device.

[0038] In the above embodiments, the molecular chain segments of the organic aerogel material have polar functional groups, such as oxygen, hydrogen, nitrogen atoms, etc. These polar functional groups interact with the reinforcing material, so that the organic aerogel material can act as an adhesive to bond the dispersed reinforcing materials together. When the dome 1 is subjected to a load, the organic aerogel can act as a medium to disperse the load, and the reinforcing material can increase the strength and modulus of the dome 1. The two interact with each other, so that the prepared dome 1 has a higher modulus-to-density ratio, so that the dome 1 has both rigidity and damping properties, and obtains excellent mechanical properties.

[0039] Furthermore, if the proportion of the organic aerogel matrix is ​​too high or too low, the modulus-density ratio of the dome 1 will be affected, and the modulus-density ratio of the dome 1 can be adjusted by the proportion of the mass of the organic aerogel matrix relative to the total mass of the dome 1. When the mass proportion of the organic aerogel matrix is ​​too high, it will affect the proportion of the reinforcing material, resulting in a decrease in the modulus of the dome 1 and a decrease in the mechanical properties. When the mass proportion of the organic aerogel is low, the mass of the dome 1 will be heavier, resulting in a decrease in the modulus-density ratio of the dome 1.

[0040] In the present invention, the mass proportion of the organic aerogel substrate is set to 10% to 95%, for example, the mass proportion of the organic aerogel substrate can be 10%, 15%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95%, etc. At this time, the proportion of the reinforcing material can also be maintained within a suitable range, so that the modulus density ratio of the final ball top 1 can be greater than or equal to 5 GPa·cm 3 / g, for example 5GPa·cm 3 / g, 6GPa·cm 3 / g, 8GPa·cm 3 / g、10GPa·cm 3 / g, 20GPa·cm 3 / g、30GPa·cm 3 / g, etc., which can meet the requirements of mechanical properties and weight at the same time. When this dome 1 is applied to a sound-emitting device, it can not only meet the design requirements of lightweight and miniaturization, but also take into account its acoustic performance, so that the sound-emitting device has good mid- and low-frequency sensitivity and suitable high-frequency cut-off frequency, thereby improving the acoustic reliability of the sound-emitting device.

[0041] Optionally, the modulus density of the dome 1 is 5 GPa·cm 3 / g~40GPa·cm 3 / g.

[0042] Specifically, when the modulus density of the dome 1 is relatively large, the high-frequency cutoff frequency of the sound-generating device can be increased. However, when it is too high, it means that there is less organic aerogel material in the dome 1 and more reinforcing material, which may easily lead to the mass of the prepared dome 1 being too large, which is not conducive to the design requirements of the light and small sound-generating device. If the modulus density ratio of the dome 1 is too small, it means that there is more organic aerogel material in the dome 1 and less reinforcing material, which will lead to poor structural stability of the dome 1. In this embodiment, the modulus density ratio of the dome 1 is limited to 5 GPa·cm 3 / g~40GPa·cm 3 / g, for example 5GPa·cm 3 / g, 8GPa·cm 3 / g、10GPa·cm 3 / g, 15GPa·cm 3 / g, 20GPa·cm 3 / g, 25GPa·cm 3 / g、30GPa·cm 3 / g, 40GPa·cm 3 / g, etc., which can take into account the mass and rigidity of the dome 1 at the same time, and further improve the high-frequency cutoff frequency of the sound-emitting device.

[0043] Optionally, the damping value of the spherical top 1 is 0.02-0.15.

[0044] Specifically, inorganic silica aerogel is currently used in the market to make the dome 1, but silica aerogel has the disadvantage of being brittle, which will directly lead to a decrease in the acoustic reliability of the prepared sound-generating device. In the present invention, since the molecules on the molecular chain segments of the organic aerogel material are entangled with each other and the spatial hindrance is large, the internal friction of the material is large. After combining with the reinforcing material, a three-dimensional skeleton structure can be formed. The reinforcing material will also inhibit the shrinkage of the organic aerogel to a certain extent, so that the prepared dome 1 will not collapse during use. The reinforcing material is dispersed in the organic aerogel matrix to improve the strength of the entire structure, so that the prepared dome 1 has both rigidity and damping properties.

[0045] In practical applications, if the damping value of the dome 1 is too high, it is easy to reduce its rigidity, which in turn reduces the response speed of the dome 1 during high-frequency vibration. If the damping value of the dome 1 is too low, it will cause the dome 1 to easily resonate and break during high-frequency vibration, which will cause the high-frequency frequency response curve to be not smooth enough, affecting the acoustic effect of the sound-generating device. In this embodiment, the damping of the dome 1 is limited to between 0.02 and 0.15, such as 0.02, 0.03, 0.05, 0.08, 0.09, 0.1, 0.12, 0.13, 0.14, etc., so that the dome 1 has good acoustic performance. The adjustment of the damping value can also be achieved by adjusting the mass of the organic aerogel matrix or the reinforcing material relative to the total mass of the dome 1, and the present invention is not limited to this.

[0046] Optionally, the bending modulus of the dome 1 is 0.5 GPa to 15 GPa.

[0047] Specifically, during the use of the sound-generating device, the stronger the anti-bending deformation ability of the dome 1 is, the less likely the dome 1 is to deform during the vibration process. In the process of preparing the dome 1 of the present invention, a reinforcing material is added to the organic aerogel layer matrix, so that the bending modulus of the prepared dome 1 reaches 0.5GPa to 15GPa, for example, 0.5GPa, 0.8GPa, 1GPa, 2GPa, 5GPa, 8GPa, 10GPa, 12GPa, 14GPa, 15GPa, etc., which reduces the risk of excessive deformation of the dome 1 during the vibration process, avoids the phenomenon of polarization of the sound-generating component or split vibration under high-frequency vibration, and improves the sound performance of the sound-generating device. Preferably, when the bending modulus of the dome 1 is 5.7GPa, the dome 1 can show excellent anti-deformation ability, has high structural stability, and can improve the sound effect of the sound-generating device.

[0048] Optionally, the compression modulus of the dome 1 is 0.3 GPa to 8 GPa.

[0049] Specifically, in the actual sounding process of the sound-generating device, the dome 1 needs to have a certain ability to resist compression deformation in the thickness direction, that is, the dome 1 has a strong ability to resist longitudinal deformation, so as to ensure the structural stability of the sound-generating device during use. The compression modulus of the dome 1 provided by the present invention can be maintained at 0.3GPa to 8GPa, such as 0.3Mpa, 0.5Mpa, 1Mpa, 2Mpa, 5Mpa, 8Mpa, etc., which improves the ability of the dome 1 to resist compression deformation while ensuring the quality of the dome 1. The application of the dome 1 in the sound-generating device can enable the sound-generating device to obtain a better sounding effect.

[0050] Optionally, the thickness of the dome 1 is 10 μm to 300 μm.

[0051] Specifically, the thickness of the dome 1 will affect the vibration space of the vibration component in the sound-generating device. If the thickness of the dome 1 is too large, the vibration space of the vibration component will be reduced, and the maximum amplitude that can be achieved will also be reduced, thereby affecting the sound-generating effect. If the thickness of the dome 1 is too small, although a part of the vibration space can be increased, it will cause the overall mechanical strength of the vibration component to decrease, affecting the high-frequency sensitivity of the sound-generating device. In this embodiment, an organic aerogel containing a porous network structure is used as the material for preparing the dome 1, so that the thickness of the dome 1 can be maintained at 10μm to 300μm, so that the dome 1 can simultaneously control the vibration space of the vibration component and the high-frequency sensitivity of the sound-generating device. Preferably, the thickness of the dome 11 is 30μm to 100μm, for example, 30μm, 40μm, 50μm, 80μm, 90μm, 100μm, etc.

[0052] In particular, when the thickness of the dome 1 is 30 μm and 50 μm, the mass of the dome 1 is relatively small, and the weight reduction effect of the dome 1 is outstanding, which is suitable for sound-generating devices with strict quality requirements on the diaphragm assembly. When the thickness of the dome 1 is 100 μm, the mass of the dome 1 is relatively large, but it can further improve the mid-frequency sensitivity and better express the vibration with the diaphragm 2.

[0053] Optionally, the reinforcement material includes reinforcement fibers and / or reinforcement particles.

[0054] Specifically, in this embodiment, the reinforcing material may be reinforcing fibers, such as chopped fibers, continuous fibers, fabrics, and non-woven fabrics, etc., or reinforcing particles, such as inorganic particles of boron nitride, silicon carbide, carbon black, aluminum oxide, and metal particles, etc. The reinforcing material may be simply one or a combination of reinforcing fiber materials, or one or a combination of reinforcing particles, or reinforcing fibers and reinforcing particles may be mixed at the same time, and the present invention is not limited thereto.

[0055] Optionally, in one embodiment, when the reinforcing material selects reinforcing fibers, if the content of reinforcing fibers is too much, it is easy to cause the fibers to be entangled with each other in the organic aerogel matrix, resulting in difficulty in dispersing them in the organic aerogel matrix, affecting the uniformity of the structural strength of each part of the prepared dome 1, and also causing the proportion of the organic aerogel matrix to decrease, which is not conducive to meeting the light weight requirement of the dome 1. If the content of reinforcing fibers is too little, the purpose of improving the structural strength of the dome 1 cannot be achieved. In this embodiment, the amount of fiber reinforcement material added can be maintained at 5% to 50% of the total mass of the dome 1, such as 5%, 10%, 15%, 20%, 30%, 40%, 50%, etc., which can take into account both the structural uniformity and structural strength of the dome 1.

[0056] Optionally, in another embodiment, when the reinforcing material is reinforcing particles, if the content of the reinforcing particles is too much, it is easy to cause the proportion of the organic aerogel substrate to decrease, which is not conducive to meeting the light weight requirement of the dome 1. If the content of the reinforcing particles is too little, the purpose of improving the structural strength of the dome 1 cannot be achieved. In this embodiment, the mass of the reinforcing particles accounts for 5% to 40% of the total mass of the dome 1, for example, 5%, 10%, 15%, 20%, 30%, 40%, etc., which can take into account both the weight and structural strength of the dome 1.

[0057] Optionally, the reinforcing material includes the reinforcing fibers and the reinforcing particles, wherein the mass proportion of the reinforcing fibers in the dome 1 is greater than the mass proportion of the reinforcing particles.

[0058] Specifically, in this embodiment, reinforcing fibers and reinforcing particles can be added to the organic aerogel matrix at the same time, wherein the reinforcing fibers can support the organic aerogel matrix and can bear most of the load of the dome 1, while the reinforcing particles can constrain the mechanical deformation of the organic aerogel to improve the strength and modulus of the dome 1. The reinforcing fibers and reinforcing particles are respectively combined with the organic aerogel matrix to jointly improve the strength of the dome 1, and by adjusting the ratio of the reinforcing fibers to the reinforcing particles, the mass and modulus of the dome 1 can have higher design convenience.

[0059] Preferably, the ratio of reinforcing fiber to reinforcing particle is ≥ 50%, that is, the content of reinforcing fiber in the dome 1 can be designed to be greater than the content of reinforcing particle, so as to improve the load-bearing capacity of the dome 1. For example, the mass of reinforcing fiber accounts for 30% of the total mass of the dome 1, and the mass of reinforcing particle accounts for 20% of the total mass of the dome 1.

[0060] The present invention further provides a diaphragm assembly of a sound-generating device, comprising a diaphragm 2 and the dome 1 of the sound-generating device described in the above embodiment, wherein the dome 1 is bonded to the diaphragm 2 or the dome 1 and the diaphragm 2 are integrally injection molded.

[0061] Specifically, the dome 1 can be bonded to the diaphragm 2 by glue or the like, which is easy to implement in terms of technology and has low cost. The dome 1 can also be integrally injection molded with the diaphragm 2, which has high structural stability and can prevent polarization of the diaphragm assembly during the sound-generating process of the sound-generating device. The diaphragm 2 can be made of engineering plastics, such as polyetheretherketone (PEEK), PAR, etc., or made of elastomeric materials, such as thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), rubber, etc., and can also be made of adhesive films, such as acrylic adhesives, silicone adhesives, etc.

[0062] In another embodiment, the diaphragm 2 can also be made of a composite of the above-mentioned materials, and the present invention is not limited thereto. In addition, the thickness of the diaphragm 2 can be set between 0.01 mm and 0.5 mm, for example, 0.01 mm, 0.05 mm, 0.1 mm, 0.3 mm, and 0.5 mm.

[0063] The above-mentioned diaphragm assembly is applied to a sound-emitting device. Since its dome 1 has an organic aerogel substrate and reinforcing materials dispersed in the organic aerogel substrate, the mass of the entire diaphragm assembly is relatively light. During the vibration process, the sound-emitting device is assisted to obtain better low-frequency performance and mid-frequency sensitivity, as well as high-frequency cutoff frequency.

[0064] The present invention also provides a sound-generating device, including the diaphragm assembly in the above-mentioned embodiment, which adopts a diaphragm assembly including the ball top 1 provided by the present invention, which can meet the design requirements of lightness and miniaturization on the one hand, and has good acoustic performance and acoustic reliability on the other hand.

[0065] The present invention also provides an electronic device, comprising the sound-generating device in the above embodiment. The electronic device may be a mobile phone, a laptop computer, a tablet computer, a VR (virtual reality) device, an AR (augmented reality) device, a TWS (true wireless Bluetooth) headset, a smart speaker, etc., and the present invention does not limit this.

[0066] In order to make the technical scheme and corresponding technical effects of the present invention clearer, the present invention specifically provides the following embodiments and comparative examples to specifically illustrate the technical scheme.

[0067] Embodiment 1:

[0068] This embodiment provides a dome 1 of a sound-generating device, which is made of an organic aerogel matrix and a reinforcing material dispersed in the organic aerogel matrix, wherein the material type of the organic aerogel is a polyimide material, and the reinforcing material is a carbon fiber. The specific preparation steps are as follows:

[0069] Step 1: Take 50 g of polyamic acid salt and prepare an organic aerogel precursor with a mass fraction (solid content) of 15%.

[0070] Step 2: Heat the organic aerogel precursor prepared in the first step to 60°C, take 1.875g of continuous carbon fiber and soak it in the organic aerogel precursor for 30 minutes, place the organic aerogel precursor soaked with carbon fiber into the mold of the ball top 1, and hot press it at 60°C for 15s to obtain the formed ball top 1.

[0071] Step 3: Freeze the formed ball top 1 at -40°C for 1 hour, and dry it at a vacuum degree of <100 Pa for 2 hours.

[0072] Step 4: The dome 1 formed in the third step is imidized at 300° C. for 2 h to obtain a carbon fiber organic aerogel dome 1 (hereinafter referred to as the dome 1 of Example 1).

[0073] According to detection, in the carbon fiber organic aerogel dome 1 obtained in Example 1, the mass of the organic aerogel matrix accounts for 80% of the total mass of the dome 1.

[0074] Comparative Example 1:

[0075] In this comparative example, a phenolic resin dome 1 (hereinafter referred to as the dome 1 of comparative example 1) made of phenolic resin material is provided, and its thickness is the same as that of the dome 1 of embodiment 1. The preparation process is prepared by traditional hot pressing molding, and the specific preparation process is omitted.

[0076] The thickness, mass, bending modulus, damping value, thermal deformation temperature and modulus-density ratio of the dome 1 of the above-mentioned embodiment 1 and the dome 1 of the comparative example 1 were tested, and the results are shown in Table 1:

[0077] Table 1 Comparison of various parameters of dome 1

[0078] Parameters Dome of Example 1 Comparative Example 1 Dome Thickness / μm 150 150 Mass / mg 21.2 32.5 Flexural modulus / GPa 5.7 4.6 Damping value 0.11 0.06 <![CDATA[Modulus density ratio / GPa·cm 3 / g]]> 6.21 2.92 Heat deformation temperature / ℃ 250 120

[0079] It can be seen from Table 1 that the dome 1 of the same thickness is prepared by using the technical solution provided by the present invention, that is, the dome 1 prepared by using the organic aerogel matrix and the reinforcing material in Example 1, wherein the mass of the organic aerogel matrix accounts for between 10% and 95% of the total mass of the dome 1. By comparison, it can be seen that the mass of the dome 1 of Example 1 is reduced by 11.3 mg compared with the dome 1 of Comparative Example 1. This shows that the dome 1 provided by the present invention is more conducive to the design requirements of lightness, thinness and miniaturization.

[0080] In addition, the heat deformation temperature refers to whether a material can remain unchanged under high temperature and pressure conditions. The heat deformation temperature is generally used to indicate the short-term heat resistance of a material. The heat deformation determination method used in the present invention is the ASTM D648 test method, that is, the dome 1 of Example 1 and the dome 1 of Comparative Example 1 are placed in an environment of 455 kPa at the center of a standard test piece, and the temperature is increased at 2°C / min until the deformation along the thickness direction of the dome is 5%, which is the heat deformation temperature.

[0081] It can be seen from Table 1 that the bending modulus of the dome 1 of Example 1 is increased by 1.1 GPa compared with the dome 1 of Comparative Example 1, and the thermal deformation temperature is increased by 130° C. This shows that the dome 1 provided by the present invention has stronger deformation resistance, higher structural stability, and can be applied in a wider temperature range than the traditional dome 1, thus expanding the use environment of the sound-generating device.

[0082] It can also be seen from Table 1 that the modulus density ratio of the dome 1 of Example 1 is increased by 3.29 GPa·cm compared with that of Comparative Example 1. 3 / g, the damping value is increased by 0.05. This shows that the sphere provided by the present invention can make the sound-generating device have a better acoustic effect.

[0083] In order to make it clearer that the dome 1 provided by the present invention improves the acoustic effect of the sound-generating device, the dome 1 of Example 1 and the dome 1 of Comparative Example 1 are respectively assembled with the diaphragm 2 made of the same polyurethane film to form a diaphragm assembly, Figure 1 to Figure 2 , and further assembled into a sound-generating device of the same model to test its acoustic performance. The resulting frequency response (FR) curve is shown in the figure below: Figure 2 As shown. Among them, the horizontal axis of the frequency response curve is frequency (Hz), and the vertical axis is loudness (dB). The higher the loudness, the higher the sensitivity.

[0084] Depend on Figure 2 It can be seen that the sound-generating device made of the dome 1 of Example 1 has higher mid-frequency sensitivity. When the sound-generating device is working, the difference between the peak and the trough of the FR curve of the sound-generating device prepared by the dome 1 of Example 1 is about 6dB, and the difference between the peak and the trough of the FR curve of the sound-generating device prepared by the dome 1 of Comparative Example 1 is about 10dB, which shows that the dome 1 of Example 1 has excellent damping properties, making the sound absorption curve smoother, reducing the generation of high-frequency resonance, making the sound-generating device have a good listening effect, and is more suitable for applications in the field of high-precision acoustics.

[0085] It should be noted that the above embodiments focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0086] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A dome of a sound-generating device, It is characterized in that The dome comprises an organic aerogel matrix and a reinforcing material dispersed in the organic aerogel matrix; the mass of the organic aerogel matrix accounts for 10% to 95% of the total mass of the dome, and the modulus-to-density ratio of the dome is greater than or equal to 5 GPa·cm 3 / g, the damping value of the spherical top is 0.02-0.15, and the bending modulus of the spherical top is 0.5 GPa-15 GPa.

2. The dome of the sound-generating device according to claim 1, It is characterized in that The modulus-to-density ratio of the dome is 5 GPa·cm 3 / g~40GPa·cm 3 / g.

3. The dome of the sound-generating device according to claim 1, It is characterized in that The thickness of the dome is 10 μm to 300 μm.

4. The dome of the sound-generating device according to claim 1, It is characterized in that The reinforcing material includes reinforcing fibers and / or reinforcing particles.

5. The dome of the sound-generating device according to claim 4, It is characterized in that The reinforcing material is reinforcing fiber, and the mass of the reinforcing fiber accounts for 5% to 50% of the total mass of the dome.

6. The dome of the sound-generating device according to claim 4, It is characterized in that The reinforcing material is reinforcing particles, and the mass of the reinforcing particles accounts for 5% to 40% of the total mass of the dome.

7. The dome of the sound-generating device according to claim 4, It is characterized in that The reinforcing material includes the reinforcing fibers and the reinforcing particles, wherein the mass proportion of the reinforcing fibers in the dome is greater than the mass proportion of the reinforcing particles.

8. The dome of the sound-generating device according to claim 4, It is characterized in that The reinforcing fiber is at least one of chopped fiber, continuous fiber, fabric and non-woven fabric; and / or, The reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black, aluminum oxide and metal particles.

9. The dome of the sound-generating device according to claim 1, It is characterized in that The organic aerogel matrix is ​​made of at least one material selected from the group consisting of polyimides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides and organosilicones.

10. A diaphragm assembly of a sound-generating device, It is characterized in that include: A diaphragm and a dome of the sound-generating device according to any one of claims 1 to 9, wherein the dome is bonded to the diaphragm, or the dome and the diaphragm are integrally injection-molded.

11. The diaphragm assembly of the sound-generating device according to claim 10, It is characterized in that The diaphragm is made of one or more composite materials selected from engineering plastics, elastomeric materials and adhesive films, and the thickness of the diaphragm is 0.01 mm to 0.5 mm.

12. A sound-generating device, It is characterized in that include: The diaphragm assembly according to claim 10 or 11.

13. An electronic device, It is characterized in that include: The sound-generating device according to claim 12.

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